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// $Id: B4DetectorConstruction.hh 75215 2013-10-29 16:07:06Z gcosmo $
// 
/// \file B4DetectorConstruction.hh
/// \brief Definition of the B4DetectorConstruction class

#ifndef B4DetectorConstruction_h
#define B4DetectorConstruction_h 1

#include "G4VUserDetectorConstruction.hh"
#include "globals.hh"

class G4VPhysicalVolume;
class G4GlobalMagFieldMessenger;

/// Detector construction class to define materials and geometry.
/// The calorimeter is a box made of a given number of layers. A layer consists
/// of an absorber plate and of a detection gap. The layer is replicated.
///
/// Four parameters define the geometry of the calorimeter :
///
/// - the thickness of an absorber plate,
/// - the thickness of a gap,
/// - the number of layers,
/// - the transverse size of the calorimeter (the input face is a square).
///
/// In addition a transverse uniform magnetic field is defined 
/// via G4GlobalMagFieldMessenger class.

class B4DetectorConstruction : public G4VUserDetectorConstruction
{
  public:
    B4DetectorConstruction();
    virtual ~B4DetectorConstruction();

  public:
    virtual G4VPhysicalVolume* Construct();
    virtual void ConstructSDandField();

    // get methods
    //
    const G4VPhysicalVolume* GetAbsorberPV() const;
    const G4VPhysicalVolume* GetGapPV() const;
     
  private:
    // methods
    //
    void DefineMaterials();
    G4VPhysicalVolume* DefineVolumes();
  
    // data members
    //
    static G4ThreadLocal G4GlobalMagFieldMessenger*  fMagFieldMessenger; 
                                      // magnetic field messenger
     
    G4VPhysicalVolume*   fAbsorberPV; // the absorber physical volume
    G4VPhysicalVolume*   fGapPV;      // the gap physical volume
    
    G4bool  fCheckOverlaps; // option to activate checking of volumes overlaps
};

// inline functions

inline const G4VPhysicalVolume* B4DetectorConstruction::GetAbsorberPV() const { 
  return fAbsorberPV; 
}

inline const G4VPhysicalVolume* B4DetectorConstruction::GetGapPV() const  { 
  return fGapPV; 
}
     

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#endif